Bleifreie Piezoelektrische Zusammensetzung, Piezoelektrisches Element und Vorrichtung

Details

Veröffentlichungs-Nr.

EP4772492

Anmeldetag

2. August 2024

Veröffentlichung

6. März 2025

Rechtsraum

EP

Abstract

The lead-free piezoelectric composition includes a primary phase formed of an alkali niobate-based perovskite oxide, and a secondary phase containing a compound which has a tungsten bronze-type structure including niobium (Nb) and at least one species selected from among barium (Ba), calcium (Ca), strontium (Sr), sodium (Na), and potassium (K). The he secondary phase satisfies at least one condition among three conditions in relation to 80% cumulative frequency grain size (D80), 50% cumulative frequency grain size (D50), and 20% cumulative frequency grain size (D20), in a volume-based grain size distribution, represented by the following numerical expressions (1) to (3): 1.3 μm ≤ D 80 ≤ 218.6 μm <img class="EMIRef" id="aade9c85-29ee-47b7-8454-772c86e53033-ia01" /> 0.4 µm≤D50≤68.7 µm ··· (2), and 0.1 μm ≤ D 20 ≤ 22.2 μm <img class="EMIRef" id="aade9c85-29ee-47b7-8454-772c86e53033-ia02" />

Anmelder

Firma

Niterra Co., Ltd.

Land

🇯🇵 Japan